Reconstructing Long-Term Sea Level Changes and Estimating Vertical Land Motions in the North Pacific Ocean Using Satellite Altimetry and Tide Gauges

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簡歷

基本資料

Project title

Code/計畫編號

MOST109-2121-M019-001

Translated Name/計畫中文名

利用衛星測高和潮位站資料重建北太平洋長期海水面變化與估計地表垂直變動速率

Project Coordinator/計畫主持人

Wen-Hau Lan

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Communications, Navigation and Control Engineering

Website

https://www.grb.gov.tw/search/planDetail?id=13534298

Year

2020

Start date/計畫起

01-08-2020

Expected Completion/計畫迄

31-10-2021

Bugetid/研究經費

448千元

ResearchField/研究領域

電子電機工程

In recently years, global sea level rise is primarily affected by global warming and climate change, which will cause significant impacts on low-lying coastal areas and island nations. Since regional changes in sea levels vary in different regions, the rates of sea level change are not uniform globally. And local sea level variations that deviate from a global average rate remain poorly understood. In addition, sea level in the North Pacific Ocean exhibits significant interannual and decadal variability, which means that sea level trend determined using short-term data is contaminated by low-frequency climate variability. Therefore, accurate estimate absolute sea level variation in the North Pacific Ocean is of scientific and practical importance. Tide gauge records and satellite radar altimetry data are the contemporary instruments used to monitor sea level changes. However, tide gauge data records, although with long data records (> 60 years), include spatially varying vertical land motions whose rates calculated are still a challenge in geodesy. Even with multiple and successive satellite missions measuring global sea level change, satellite radar altimetry only spans ~20 years, resulting in errors of sea level determination significantly contaminated by the low-frequency sea level signals. In this study, we focus on calculating long-term sea level changes in the North Pacific Ocean using a novel modified sea level reconstruction method, which simultaneously estimates vertical motions at tide gauges, and long-term absolute sea level variations using the combination of long-term (> 60 years) tide gauge records and multi-mission altimeter measurements. In addition, we will determine long-term absolute sea level trends using sea level reconstruction data, and also analyze the relationship between low-frequency climate variability and long-term sea level change and the possible mechanism in the North Pacific Ocean. 近幾十年來，全球海水面上升主要受到全球暖化與氣候變遷影響，對於沿岸低漥地區或海島型國家將首先造成嚴重衝擊。海水面之區域變化因地而異，全球並非以相同速率上升，而我們對於區域海水面變化知之甚少，且北太平洋的海水面表現出明顯的年際和年代際變化，表示利用短期資料進行分析容易受到低頻訊號影響，因此精確分析北太平洋絕對海水面變化為一相當重要之課題。傳統上，主要以衛星雷達測高與潮位站監測海水面昇降變化，然而，潮位站雖然包含長期觀測記錄(> 60年)，但其觀測資料包括地表垂直變動訊號，至今仍是不容易處理的科學問題; 而衛星測高資料時間涵蓋僅20年左右，導致分析時容易受到低頻氣候變遷訊號影響。因此，本研究將提出一新穎的改良式海水面重建演算法，結合長期(> 60年)潮位站紀錄與衛星測高資料，進行北太平洋長期海水面變化之重建，並同時計算出測站地表垂直變動速率。此外，亦將利用重建之海水面計算北太平洋長期海水面上升速率，並探討低頻震盪與北太平洋海水面變化之關係。

Keyword(s)

海水面重建
地表垂直變動
衛星測高
潮位站
Sea level reconstruction
Vertical land motion
Satellite altimetry
Tide gauge

DSpace CRIS

Reconstructing Long-Term Sea Level Changes and Estimating Vertical Land Motions in the North Pacific Ocean Using Satellite Altimetry and Tide Gauges

基本資料

Description